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Transportation of respiratory gases

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Introduction

Transportation of respiratory gases Transport of oxygen 98% of the oxygen that is transported from the lungs to the requiring tissues travels within our red blood cells, carried by haemoglobin. Globular protein, Quaternary structure Iron Each HAEM group can bind 1 oxygen molecule (O2) Therefore a haemoglobin molecule can exist in a number of forms: i. Hb4 0% (saturation) ii. Hb4O2 25% iv. Hb404 50% v. ...read more.

Middle

1- Haemoglobin in red blood cells is exposed too a high pp of oxygen ( around 100mm of mercury).The graph shows that Hb molecules here will be fully saturated. 2- Red blood cells containing saturated Hb now travel in circulation until eventually exposed to a lower pp of O2 where cell actively respires. 3- Hb is obliged to release the oxygen it carries that represents the difference between point 3 and 100% saturation ( point 4) ...read more.

Conclusion

Saturation Of Hb (%) p.O2 (mm.Hg) 1- As before because haemoglobin is not exposed to less alkali conditions. 2- Hb and red blood cells arrived in respiring cells where Ph is lower. 3- This requires us to use the red curve. 4- Wee can see that more oxygen will be dissociated than would have been if the PH had not been lower. Thus the Bohr shift is an enhancement of the oxygen dissociation curve that delivers more O2 to those tissues that require it the most. i.e. the Ph begin lowered makes Hb dissociate more O2. ...read more.

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